Roger-
Get Camco -100 Boiler Antifreeze (not just any old antifreeze!!). I often find it at True Value hardware stores and not at Camping World (go figure), and it has always been cheaper there than at most RV supply stores. Then mix it 50/50 with water, preferrably distilled but that's optional if not convenient, before adding to the tank. Fill the tank only to the "Cold" mark, since you haven't been running it. Then watch it after the unit has run for awhile and warmed up to make sure it's at the right fill level.
Depending on how much your system is depleted, you may or may not need a second gallon of boiler antifreeze; mixing it 50/50 I'd think not. But the stuff can be hard to find, so be sure you buy enough to carry extra with you for later top-ups. Better to have more than enough than not enough, and if you buy the boiler antifreeze locally you can always take the second gallon back.
Regarding the tune-up, I tried to do mine last year after some coaching from Beaver Service Center techs, and once I understood the mechanism, changing the nozzle and cleaning soot wasn't tough. But it was a mell of a hess changing the filter. BSC parts sold me the wrong one for starters, so be sure you write down the info straight off your existing one before getting a new one; filters for these things often get changed mid-build, so parts books can be wrong. Then our filter was hard to reach, and diesel went everywhere around and underneath the HydroHot, even though I tried to be careful removing the thing. At least as far as the filter goes, which all the techs said was a piece of cake, I'd not try changing it again myself - mopping up that mess, then leaving the bay door open for days to air out diesel fumes (and listening to the buscuit burner complain of the smell) was not worth it.
Joel
